"That's where the stupid people are," the former Godfather's Pizza CEO told a packed room during a luncheon at the California Republican Party convention in Burlingame.

Cain, who dropped out of the race in December after allegations of sexual harassment surfaced, urged attendees to stay involved and inspired in politics as they work to maintain control of the House of Representatives, win the U.S. Senate majority and "alter the occupant of the White House."

"Know your facts. Stupid people are ruining America," he said, reviving a line he has used often on the campaign trail and in public appearances.

Cain was welcomed with cheers and a standing ovation as he appeared at the convention to voice support for presidential candidate Newt Gingrich, the guest speaker for the luncheon. He praised the former House Speaker's "bold leadership" and said he is the best person to revive a sluggish economy.

"We have a message for Barack Obama. We have a message for a broken Washington DC," he said. "We the people are coming. We want our power back and it's going to be led by Speaker Newt Gingrich in 2012." Â